Re:iOS at Facebook [pdf]
by zacblazic on Friday September 25, 2015 @12:00PM
(#10278882)
Partly! The tools they mentioned (IDE, Mercurial) don't impact the app itself though. Which makes them irrelevant and doesn't factor into why their codebase is massive.
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They are relevant if you take them for what they are: examples that explains, in a general way, why FB has large codebase. Because when something doesn't fits their needs they will write their own version.
So I guess with iOS they wrote/rewrote some part of the system functionnalities to better fit their needs.